Upgrade Windows projects to Visual Studio 2013.

BUG=14625486

Change-Id: I6a29ec3294f34136209d991b37d6b4d80723d3a7
diff --git a/src/SwiftShader.sln b/src/SwiftShader.sln
index e2ad24e..269e0e4 100644
--- a/src/SwiftShader.sln
+++ b/src/SwiftShader.sln
@@ -1,5 +1,5 @@
-Microsoft Visual Studio Solution File, Format Version 11.00

-# Visual Studio 2010

+Microsoft Visual Studio Solution File, Format Version 12.00

+# Visual Studio 2013

 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "LLVM", "LLVM", "{B408B98A-E888-4ECF-81E0-7A37A6854B17}"

 EndProject

 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SwiftShader", "SwiftShader\SwiftShader.vcxproj", "{7B02CB19-4CDF-4F79-BC9B-7F3F6164A003}"